Canon NP6045 Service Manual page 144

CHAPTER 4 IMAGE FORMATION SYSTEM
Turning OFF the Roller Electrode
• When the high-voltage DC remote signal (DCBTP) is '0' and the roller bias
signal (ROED) is '0', the switching circuit turns OFF and the high-voltage
transformer drive circuit turns OFF. The DC transformer T402 turns OFF to
deprive the roller electrode of the bias.
Signal*
HVT output
DC bias ON
DC bias OFF
Roller bials ON
Roller bials OFF
* The connector number of the signal name represents the output from the DC controller PCB.
Table 4-202 Combination of Developing DC/Roller Electrode Bias Output Signals
4-34
COPYRIGHT © 1997 CANON INC.
Switching signal
DCBTP ACBTP
J114A-10 J114A-3
'1' '1'
'0' '0'
'0' '0'
'0' '0'
ROED
J114A-1
'1'
'0'
'1'
'0'
CANON NP6045 REV. 1 MAR. 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
Control signal
ACON DCBC
J114A-7 J114A-2
'0' 3~11V
'0' 2V
'0' —
'0' —